["What is normal?" - Ideals Exemplified on andrological aspects (author's transl)]

In andrology ther term "normal" stands for mean value but indicates also male fertility. Some data (ejaculate parameters, testis volume, coitus frequency, hormone levels) are discussed with special reference to the relation of age and fertility. The general situation of the patients has to be evaluated not single data only. It is postulated that the sexual behaviour of a couple is normal if both partners tolerate this. We promise a reconsideration of the present norm values of the ejaculate.